﻿/*
 * Copyright (C) 2021-2024, 5DPLAY Game Studio
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.play5d.kyo.encoder {
import flash.display.*;
import flash.utils.*;

public class JPGEncoder {

    // Static table initialization

    public function JPGEncoder(quality:Number = 50) {
        if (quality <= 0) {
            quality = 1;
        }
        if (quality > 100) {
            quality = 100;
        }
        var sf:int = 0;
        if (quality < 50) {
            sf = int(5000 / quality);
        }
        else {
            sf = int(200 - quality * 2);
        }
        // Create tables
        initHuffmanTbl();
        initCategoryNumber();
        initQuantTables(sf);
    }

    private var ZigZag:Array                     = [
        0, 1, 5, 6, 14, 15, 27, 28,
        2, 4, 7, 13, 16, 26, 29, 42,
        3, 8, 12, 17, 25, 30, 41, 43,
        9, 11, 18, 24, 31, 40, 44, 53,
        10, 19, 23, 32, 39, 45, 52, 54,
        20, 22, 33, 38, 46, 51, 55, 60,
        21, 34, 37, 47, 50, 56, 59, 61,
        35, 36, 48, 49, 57, 58, 62, 63
    ];
    private var YTable:Array                     = new Array(64);
    private var UVTable:Array                    = new Array(64);
    private var fdtbl_Y:Array                    = new Array(64);
    private var fdtbl_UV:Array                   = new Array(64);
    private var YDC_HT:Array;
    private var UVDC_HT:Array;
    private var YAC_HT:Array;
    private var UVAC_HT:Array;
    private var std_dc_luminance_nrcodes:Array   = [0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0];
    private var std_dc_luminance_values:Array    = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
    private var std_ac_luminance_nrcodes:Array   = [0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d];
    private var std_ac_luminance_values:Array    = [
        0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
        0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
        0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
        0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
        0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
        0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
        0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
        0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
        0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
        0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
        0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
        0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
        0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
        0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
        0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
        0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
        0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
        0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
        0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
        0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
        0xf9, 0xfa
    ];
    private var std_dc_chrominance_nrcodes:Array = [0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0];
    private var std_dc_chrominance_values:Array  = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
    private var std_ac_chrominance_nrcodes:Array = [0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77];
    private var std_ac_chrominance_values:Array  = [
        0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
        0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
        0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
        0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
        0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
        0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
        0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
        0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
        0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
        0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
        0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
        0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
        0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
        0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
        0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
        0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
        0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
        0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
        0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
        0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
        0xf9, 0xfa
    ];
    private var bitcode:Array                    = new Array(65535);
    private var category:Array                   = new Array(65535);
    private var byteout:ByteArray;
    private var bytenew:int                      = 0;
    private var bytepos:int                      = 7;

    // IO functions
    // Core processing
    private var DU:Array  = new Array(64);
    private var YDU:Array = new Array(64);
    private var UDU:Array = new Array(64);
    private var VDU:Array = new Array(64);

    public function encode(image:BitmapData):ByteArray {
        // Initialize bit writer
        byteout = new ByteArray();
        bytenew = 0;
        bytepos = 7;

        // Add JPEG headers
        writeWord(0xFFD8); // SOI
        writeAPP0();
        writeDQT();
        writeSOF0(image.width, image.height);
        writeDHT();
        writeSOS();


        // Encode 8x8 macroblocks
        var DCY:Number = 0;
        var DCU:Number = 0;
        var DCV:Number = 0;
        bytenew        = 0;
        bytepos        = 7;
        for (var ypos:int = 0; ypos < image.height; ypos += 8) {
            for (var xpos:int = 0; xpos < image.width; xpos += 8) {
                RGB2YUV(image, xpos, ypos);
                DCY = processDU(YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT);
                DCU = processDU(UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
                DCV = processDU(VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
            }
        }

        // Do the bit alignment of the EOI marker
        if (bytepos >= 0) {
            var fillbits:BitString = new BitString();
            fillbits.len           = bytepos + 1;
            fillbits.val           = (
                                             1 << (
                                                     bytepos + 1
                                             )
                                     ) - 1;
            writeBits(fillbits);
        }

        writeWord(0xFFD9); //EOI
        return byteout;
    }

    private function initQuantTables(sf:int):void {
        var i:int;
        var t:Number;
        var YQT:Array = [
            16, 11, 10, 16, 24, 40, 51, 61,
            12, 12, 14, 19, 26, 58, 60, 55,
            14, 13, 16, 24, 40, 57, 69, 56,
            14, 17, 22, 29, 51, 87, 80, 62,
            18, 22, 37, 56, 68, 109, 103, 77,
            24, 35, 55, 64, 81, 104, 113, 92,
            49, 64, 78, 87, 103, 121, 120, 101,
            72, 92, 95, 98, 112, 100, 103, 99
        ];
        for (i = 0; i < 64; i++) {
            t = Math.floor((
                                   YQT[i] * sf + 50
                           ) / 100);
            if (t < 1) {
                t = 1;
            }
            else if (t > 255) {
                t = 255;
            }
            YTable[ZigZag[i]] = t;
        }
        var UVQT:Array = [
            17, 18, 24, 47, 99, 99, 99, 99,
            18, 21, 26, 66, 99, 99, 99, 99,
            24, 26, 56, 99, 99, 99, 99, 99,
            47, 66, 99, 99, 99, 99, 99, 99,
            99, 99, 99, 99, 99, 99, 99, 99,
            99, 99, 99, 99, 99, 99, 99, 99,
            99, 99, 99, 99, 99, 99, 99, 99,
            99, 99, 99, 99, 99, 99, 99, 99
        ];
        for (i = 0; i < 64; i++) {
            t = Math.floor((
                                   UVQT[i] * sf + 50
                           ) / 100);
            if (t < 1) {
                t = 1;
            }
            else if (t > 255) {
                t = 255;
            }
            UVTable[ZigZag[i]] = t;
        }
        var aasf:Array = [
            1.0, 1.387039845, 1.306562965, 1.175875602,
            1.0, 0.785694958, 0.541196100, 0.275899379
        ];
        i              = 0;
        for (var row:int = 0; row < 8; row++) {
            for (var col:int = 0; col < 8; col++) {
                fdtbl_Y[i]  = (
                        1.0 / (
                                YTable [ZigZag[i]] * aasf[row] * aasf[col] * 8.0
                        )
                );
                fdtbl_UV[i] = (
                        1.0 / (
                                UVTable[ZigZag[i]] * aasf[row] * aasf[col] * 8.0
                        )
                );
                i++;
            }
        }
    }

    // DCT & quantization core

    private function computeHuffmanTbl(nrcodes:Array, std_table:Array):Array {
        var codevalue:int    = 0;
        var pos_in_table:int = 0;
        var HT:Array         = new Array();
        for (var k:int = 1; k <= 16; k++) {
            for (var j:int = 1; j <= nrcodes[k]; j++) {
                HT[std_table[pos_in_table]]     = new BitString();
                HT[std_table[pos_in_table]].val = codevalue;
                HT[std_table[pos_in_table]].len = k;
                pos_in_table++;
                codevalue++;
            }
            codevalue *= 2;
        }
        return HT;
    }

    // Chunk writing

    private function initHuffmanTbl():void {
        YDC_HT  = computeHuffmanTbl(std_dc_luminance_nrcodes, std_dc_luminance_values);
        UVDC_HT = computeHuffmanTbl(std_dc_chrominance_nrcodes, std_dc_chrominance_values);
        YAC_HT  = computeHuffmanTbl(std_ac_luminance_nrcodes, std_ac_luminance_values);
        UVAC_HT = computeHuffmanTbl(std_ac_chrominance_nrcodes, std_ac_chrominance_values);
    }

    private function initCategoryNumber():void {
        var nrlower:int = 1;
        var nrupper:int = 2;
        var nr:int;
        for (var cat:int = 1; cat <= 15; cat++) {
            //Positive numbers
            for (nr = nrlower; nr < nrupper; nr++) {
                category[32767 + nr]    = cat;
                bitcode[32767 + nr]     = new BitString();
                bitcode[32767 + nr].len = cat;
                bitcode[32767 + nr].val = nr;
            }
            //Negative numbers
            for (
                    nr = -(
                            nrupper - 1
                    ); nr <= -nrlower; nr++
            ) {
                category[32767 + nr]    = cat;
                bitcode[32767 + nr]     = new BitString();
                bitcode[32767 + nr].len = cat;
                bitcode[32767 + nr].val = nrupper - 1 + nr;
            }
            nrlower <<= 1;
            nrupper <<= 1;
        }
    }

    private function writeBits(bs:BitString):void {
        var value:int  = bs.val;
        var posval:int = bs.len - 1;
        while (posval >= 0) {
            if (value & uint(1 << posval)) {
                bytenew |= uint(1 << bytepos);
            }
            posval--;
            bytepos--;
            if (bytepos < 0) {
                if (bytenew == 0xFF) {
                    writeByte(0xFF);
                    writeByte(0);
                }
                else {
                    writeByte(bytenew);
                }
                bytepos = 7;
                bytenew = 0;
            }
        }
    }

    private function writeByte(value:int):void {
        byteout.writeByte(value);
    }

    private function writeWord(value:int):void {
        writeByte((
                          value >> 8
                  ) & 0xFF);
        writeByte((
                          value
                  ) & 0xFF);
    }

    private function fDCTQuant(data:Array, fdtbl:Array):Array {
        var tmp0:Number, tmp1:Number, tmp2:Number, tmp3:Number, tmp4:Number, tmp5:Number, tmp6:Number, tmp7:Number;
        var tmp10:Number, tmp11:Number, tmp12:Number, tmp13:Number;
        var z1:Number, z2:Number, z3:Number, z4:Number, z5:Number, z11:Number, z13:Number;
        var i:int;
        /* Pass 1: process rows. */
        var dataOff:int = 0;
        for (i = 0; i < 8; i++) {
            tmp0 = data[dataOff + 0] + data[dataOff + 7];
            tmp7 = data[dataOff + 0] - data[dataOff + 7];
            tmp1 = data[dataOff + 1] + data[dataOff + 6];
            tmp6 = data[dataOff + 1] - data[dataOff + 6];
            tmp2 = data[dataOff + 2] + data[dataOff + 5];
            tmp5 = data[dataOff + 2] - data[dataOff + 5];
            tmp3 = data[dataOff + 3] + data[dataOff + 4];
            tmp4 = data[dataOff + 3] - data[dataOff + 4];

            /* Even part */
            tmp10 = tmp0 + tmp3;	/* phase 2 */
            tmp13 = tmp0 - tmp3;
            tmp11 = tmp1 + tmp2;
            tmp12 = tmp1 - tmp2;

            data[dataOff + 0] = tmp10 + tmp11; /* phase 3 */
            data[dataOff + 4] = tmp10 - tmp11;

            z1 = (
                         tmp12 + tmp13
                 ) * 0.707106781; /* c4 */
            data[dataOff + 2] = tmp13 + z1; /* phase 5 */
            data[dataOff + 6] = tmp13 - z1;

            /* Odd part */
            tmp10 = tmp4 + tmp5; /* phase 2 */
            tmp11 = tmp5 + tmp6;
            tmp12 = tmp6 + tmp7;

            /* The rotator is modified from fig 4-8 to avoid extra negations. */
            z5 = (
                         tmp10 - tmp12
                 ) * 0.382683433; /* c6 */
            z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
            z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
            z3 = tmp11 * 0.707106781; /* c4 */

            z11 = tmp7 + z3;	/* phase 5 */
            z13 = tmp7 - z3;

            data[dataOff + 5] = z13 + z2;	/* phase 6 */
            data[dataOff + 3] = z13 - z2;
            data[dataOff + 1] = z11 + z4;
            data[dataOff + 7] = z11 - z4;

            dataOff += 8; /* advance pointer to next row */
        }

        /* Pass 2: process columns. */
        dataOff = 0;
        for (i = 0; i < 8; i++) {
            tmp0 = data[dataOff + 0] + data[dataOff + 56];
            tmp7 = data[dataOff + 0] - data[dataOff + 56];
            tmp1 = data[dataOff + 8] + data[dataOff + 48];
            tmp6 = data[dataOff + 8] - data[dataOff + 48];
            tmp2 = data[dataOff + 16] + data[dataOff + 40];
            tmp5 = data[dataOff + 16] - data[dataOff + 40];
            tmp3 = data[dataOff + 24] + data[dataOff + 32];
            tmp4 = data[dataOff + 24] - data[dataOff + 32];

            /* Even part */
            tmp10 = tmp0 + tmp3;	/* phase 2 */
            tmp13 = tmp0 - tmp3;
            tmp11 = tmp1 + tmp2;
            tmp12 = tmp1 - tmp2;

            data[dataOff + 0] = tmp10 + tmp11; /* phase 3 */
            data[dataOff + 32] = tmp10 - tmp11;

            z1 = (
                         tmp12 + tmp13
                 ) * 0.707106781; /* c4 */
            data[dataOff + 16] = tmp13 + z1; /* phase 5 */
            data[dataOff + 48] = tmp13 - z1;

            /* Odd part */
            tmp10 = tmp4 + tmp5; /* phase 2 */
            tmp11 = tmp5 + tmp6;
            tmp12 = tmp6 + tmp7;

            /* The rotator is modified from fig 4-8 to avoid extra negations. */
            z5 = (
                         tmp10 - tmp12
                 ) * 0.382683433; /* c6 */
            z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
            z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
            z3 = tmp11 * 0.707106781; /* c4 */

            z11 = tmp7 + z3;	/* phase 5 */
            z13 = tmp7 - z3;

            data[dataOff + 40] = z13 + z2; /* phase 6 */
            data[dataOff + 24] = z13 - z2;
            data[dataOff + 8]  = z11 + z4;
            data[dataOff + 56] = z11 - z4;

            dataOff++; /* advance pointer to next column */
        }

        // Quantize/descale the coefficients
        for (i = 0; i < 64; i++) {
            // Apply the quantization and scaling factor & Round to nearest integer
            data[i] = Math.round((
                                         data[i] * fdtbl[i]
                                 ));
        }
        return data;
    }

    private function writeAPP0():void {
        writeWord(0xFFE0); // marker
        writeWord(16); // length
        writeByte(0x4A); // J
        writeByte(0x46); // F
        writeByte(0x49); // I
        writeByte(0x46); // F
        writeByte(0); // = "JFIF",'\0'
        writeByte(1); // versionhi
        writeByte(1); // versionlo
        writeByte(0); // xyunits
        writeWord(1); // xdensity
        writeWord(1); // ydensity
        writeByte(0); // thumbnwidth
        writeByte(0); // thumbnheight
    }

    private function writeSOF0(width:int, height:int):void {
        writeWord(0xFFC0); // marker
        writeWord(17);   // length, truecolor YUV JPG
        writeByte(8);    // precision
        writeWord(height);
        writeWord(width);
        writeByte(3);    // nrofcomponents
        writeByte(1);    // IdY
        writeByte(0x11); // HVY
        writeByte(0);    // QTY
        writeByte(2);    // IdU
        writeByte(0x11); // HVU
        writeByte(1);    // QTU
        writeByte(3);    // IdV
        writeByte(0x11); // HVV
        writeByte(1);    // QTV
    }

    private function writeDQT():void {
        writeWord(0xFFDB); // marker
        writeWord(132);	   // length
        writeByte(0);
        var i:int;
        for (i = 0; i < 64; i++) {
            writeByte(YTable[i]);
        }
        writeByte(1);
        for (i = 0; i < 64; i++) {
            writeByte(UVTable[i]);
        }
    }

    private function writeDHT():void {
        writeWord(0xFFC4); // marker
        writeWord(0x01A2); // length
        var i:int;

        writeByte(0); // HTYDCinfo
        for (i = 0; i < 16; i++) {
            writeByte(std_dc_luminance_nrcodes[i + 1]);
        }
        for (i = 0; i <= 11; i++) {
            writeByte(std_dc_luminance_values[i]);
        }

        writeByte(0x10); // HTYACinfo
        for (i = 0; i < 16; i++) {
            writeByte(std_ac_luminance_nrcodes[i + 1]);
        }
        for (i = 0; i <= 161; i++) {
            writeByte(std_ac_luminance_values[i]);
        }

        writeByte(1); // HTUDCinfo
        for (i = 0; i < 16; i++) {
            writeByte(std_dc_chrominance_nrcodes[i + 1]);
        }
        for (i = 0; i <= 11; i++) {
            writeByte(std_dc_chrominance_values[i]);
        }

        writeByte(0x11); // HTUACinfo
        for (i = 0; i < 16; i++) {
            writeByte(std_ac_chrominance_nrcodes[i + 1]);
        }
        for (i = 0; i <= 161; i++) {
            writeByte(std_ac_chrominance_values[i]);
        }
    }

    private function writeSOS():void {
        writeWord(0xFFDA); // marker
        writeWord(12); // length
        writeByte(3); // nrofcomponents
        writeByte(1); // IdY
        writeByte(0); // HTY
        writeByte(2); // IdU
        writeByte(0x11); // HTU
        writeByte(3); // IdV
        writeByte(0x11); // HTV
        writeByte(0); // Ss
        writeByte(0x3f); // Se
        writeByte(0); // Bf
    }

    private function processDU(CDU:Array, fdtbl:Array, DC:Number, HTDC:Array, HTAC:Array):Number {
        var EOB:BitString       = HTAC[0x00];
        var M16zeroes:BitString = HTAC[0xF0];
        var i:int;

        var DU_DCT:Array = fDCTQuant(CDU, fdtbl);
        //ZigZag reorder
        for (i = 0; i < 64; i++) {
            DU[ZigZag[i]] = DU_DCT[i];
        }
        var Diff:int = DU[0] - DC;
        DC           = DU[0];
        //Encode DC
        if (Diff == 0) {
            writeBits(HTDC[0]); // Diff might be 0
        }
        else {
            writeBits(HTDC[category[32767 + Diff]]);
            writeBits(bitcode[32767 + Diff]);
        }
        //Encode ACs
        var end0pos:int = 63;
        for (
                ; (
                          end0pos > 0
                  ) && (
                          DU[end0pos] == 0
                  ); end0pos--
        ) {
        }
        ;
        //end0pos = first element in reverse order !=0
        if (end0pos == 0) {
            writeBits(EOB);
            return DC;
        }
        i = 1;
        while (i <= end0pos) {
            var startpos:int = i;
            for (
                    ; (
                              DU[i] == 0
                      ) && (
                              i <= end0pos
                      ); i++
            ) {
            }
            var nrzeroes:int = i - startpos;
            if (nrzeroes >= 16) {
                for (var nrmarker:int = 1; nrmarker <= nrzeroes / 16; nrmarker++) {
                    writeBits(M16zeroes);
                }
                nrzeroes = int(nrzeroes & 0xF);
            }
            writeBits(HTAC[nrzeroes * 16 + category[32767 + DU[i]]]);
            writeBits(bitcode[32767 + DU[i]]);
            i++;
        }
        if (end0pos != 63) {
            writeBits(EOB);
        }
        return DC;
    }

    private function RGB2YUV(img:BitmapData, xpos:int, ypos:int):void {
        var pos:int = 0;
        for (var y:int = 0; y < 8; y++) {
            for (var x:int = 0; x < 8; x++) {
                var P:uint   = img.getPixel32(xpos + x, ypos + y);
                var R:Number = Number((
                                              P >> 16
                                      ) & 0xFF);
                var G:Number = Number((
                                              P >> 8
                                      ) & 0xFF);
                var B:Number = Number((
                                              P
                                      ) & 0xFF);
                YDU[pos]     = (
                                       (
                                               (
                                                       0.29900
                                               ) * R + (
                                                       0.58700
                                               ) * G + (
                                                       0.11400
                                               ) * B
                                       )
                               ) - 128;
                UDU[pos]     = (
                        (
                                (
                                        -0.16874
                                ) * R + (
                                        -0.33126
                                ) * G + (
                                        0.50000
                                ) * B
                        )
                );
                VDU[pos]     = (
                        (
                                (
                                        0.50000
                                ) * R + (
                                        -0.41869
                                ) * G + (
                                        -0.08131
                                ) * B
                        )
                );
                pos++;
            }
        }
    }
}

}
